Building cmake library, I meet bug: "#error this header is for x86 only"

[Basasuya]

I try to build a cmake library into llvm bitcode. the target library is ogdf, My environment is Mac OS(mojave), emcc -v shows below:

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.38.42
clang version 6.0.1 (/b/s/w/ir/cache/git/chromium.googlesource.com-external-github.com-emscripten--core-emscripten--fastcomp--clang 98df4be387dde3e3918fa5bbb5fc43e1a0e1daac) (/b/s/w/ir/cache/git/chromium.googlesource.com-external-github.com-emscripten--core-emscripten--fastcomp 1b4148f39a69c7fc62edadd85e4122b68694dfb7) (emscripten 1.38.31 : 1.38.31)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: /Users/basasuya/emsdk/fastcomp/fastcomp/bin
shared:INFO: (Emscripten: Running sanity checks)

then I run the following command

mkdir build && cd build
emconfigure cmake ..
emmake make

then I got errors:

clang-6.0: error: argument unused during compilation: '-march=native' [-Werror,-Wunused-command-line-argument]

then I modify the file and make this line as a Comment. After modifiction, I run the previous build commands again, then I got the following error.

/Users/basasuya/emsdk/fastcomp/fastcomp/lib/clang/6.0.1/include/cpuid.h:25:2: error: this header is for x86 only
#error this header is for x86 only
 ^
/Users/basasuya/emsdk/fastcomp/fastcomp/lib/clang/6.0.1/include/cpuid.h:271:5: error: invalid output constraint '=a' in asm
    __cpuid(__leaf, __eax, __ebx, __ecx, __edx);
    ^
/Users/basasuya/emsdk/fastcomp/fastcomp/lib/clang/6.0.1/include/cpuid.h:236:11: note: expanded from macro '__cpuid'
        : "=a"(__eax), "=r" (__ebx), "=c"(__ecx), "=d"(__edx) \
          ^
/Users/basasuya/emsdk/fastcomp/fastcomp/lib/clang/6.0.1/include/cpuid.h:286:5: error: invalid output constraint '=a' in asm
    __cpuid(__leaf, *__eax, *__ebx, *__ecx, *__edx);
    ^
/Users/basasuya/emsdk/fastcomp/fastcomp/lib/clang/6.0.1/include/cpuid.h:236:11: note: expanded from macro '__cpuid'
        : "=a"(__eax), "=r" (__ebx), "=c"(__ecx), "=d"(__edx) \
          ^
/Users/basasuya/emsdk/fastcomp/fastcomp/lib/clang/6.0.1/include/cpuid.h:300:5: error: invalid output constraint '=a' in asm
    __cpuid_count(__leaf, __subleaf, *__eax, *__ebx, *__ecx, *__edx);
    ^
/Users/basasuya/emsdk/fastcomp/fastcomp/lib/clang/6.0.1/include/cpuid.h:243:11: note: expanded from macro '__cpuid_count'
        : "=a"(__eax), "=r" (__ebx), "=c"(__ecx), "=d"(__edx) \
          ^
4 errors generated.

Now I have no idea about how to fix it. Can anyone help me?

[embeddedt]

It definitely doesn't make sense to include cpuid.h, since the target CPU architecture is unknown on a web page (I think).

Do you know where cpuid.h is being included from?

[Basasuya]

@embeddedt I find the location where cpuid.h locates. Then modifed ogdf/include/ogdf/basic/internal/config.h and add #undef __GNUC__ to force the library not to use this file. The result is it works and I successfully run my code and achieve the goal.

Thank you very much for your advice sincerely!